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Do not draw Slider tick marks if they are too dense (#27969)

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This commit is contained in:
Anthony 2019-02-14 19:42:30 -05:00 committed by Hans Muller
parent d1707ab0ad
commit d1371cd269
1 changed files with 21 additions and 17 deletions
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38
packages/flutter/lib/src/material/slider.dart
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@ -1005,23 +1005,27 @@ class _RenderSlider extends RenderBox {
isEnabled: isInteractive,
sliderTheme: _sliderTheme,
).width;
for (int i = 0; i <= divisions; i++) {
final double tickValue = i / divisions;
// The ticks are mapped to be within the track, so the tick mark width
// must be subtracted from the track width.
final double tickX = trackRect.left + tickValue * (trackRect.width - tickMarkWidth) + tickMarkWidth / 2;
final double tickY = trackRect.center.dy;
final Offset tickMarkOffset = Offset(tickX, tickY);
_sliderTheme.tickMarkShape.paint(
context,
tickMarkOffset,
parentBox: this,
sliderTheme: _sliderTheme,
enableAnimation: _enableAnimation,
textDirection: _textDirection,
thumbCenter: thumbCenter,
isEnabled: isInteractive,
);
// If the ticks would be too dense, don't bother painting them.
if ((trackRect.width - tickMarkWidth) / divisions >= 3.0 * tickMarkWidth) {
for (int i = 0; i <= divisions; i++) {
final double tickValue = i / divisions;
// The ticks are mapped to be within the track, so the tick mark width
// must be subtracted from the track width.
final double tickX = trackRect.left +
tickValue * (trackRect.width - tickMarkWidth) + tickMarkWidth / 2;
final double tickY = trackRect.center.dy;
final Offset tickMarkOffset = Offset(tickX, tickY);
_sliderTheme.tickMarkShape.paint(
context,
tickMarkOffset,
parentBox: this,
sliderTheme: _sliderTheme,
enableAnimation: _enableAnimation,
textDirection: _textDirection,
thumbCenter: thumbCenter,
isEnabled: isInteractive,
);
}
}
}